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Operating, Installation Costs VaryLennox Tip: Invest in a central air conditioner that uses nonpolluting R410A refrigerant. The new refrigerant replaces chlorine-based Freon that the EPA is phasing out, because it depletes the earth's ozone. Buying an AC that handles the EPA-approved refrigerant will save you on operating costs down the road when chlorine-based refrigerants are pulled off the market.
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